Note 7 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025	Mar. 31, 2025	Oct. 07, 2022
Income Tax Paid, before Refund Received			$ 80	$ 47
GAMCO Investors, Inc. [Member]
Investment Expense Rate	0.08%	0.08%	0.08%	0.08%
Funds Invested in Mutual Funds	$ 84,045		$ 84,045		$ 36,175
Income From Mutual Funds	670	$ 177	1,386	$ 891
MtronPTI [Member]
Percentage of Shares Distribution Under Spinoff							100.00%
Salaries and Benefits Reimbursed	28	28	84	12
MtronPTI [Member] | Transitional Administrative and Management Services Agreement [Member]
Monthly Payment						$ 4
MtronPTI [Member] | Tax Indemnity and Sharing Agreement [Member]
Related Party Transaction, Amounts of Transaction	12	12	36	36
Income Tax Paid, before Refund Received	0	$ 0	0	$ 0
Alpha G Investment Management, Inc. [Member]
Salaries and Benefits Reimbursed	$ 19		$ 85